(19)

(11)

EP 3 887 792 A1

(12)

(43) Date of publication: 06.10.2021 Bulletin 2021/40 (21) Application number: 19824072.3 (22) Date of filing: 26.11.2019

(51) International Patent Classification (IPC):  G01M 11/00(2006.01) (52) Cooperative Patent Classification (CPC): G01M 11/33 (86) International application number: PCT/US2019/063141 (87) International publication number: WO 2020/112704 (04.06.2020 Gazette 2020/23)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 27.11.2018 US 201862771857 P (71) Applicant: AFL Telecommunications LLC Duncan, SC 29334 (US)	(72) Inventors: LIU, Bin Duncan, South Carolina 29334 (US) PRESCOTT, Scott Duncan, South Carolina 29334 (US) EDDY, Dale Duncan, South Carolina 29334 (US) COLLINS, Shawn P. Duncan, South Carolina 29334 (US) (74) Representative: Serjeants LLP  Dock 75 Exploration Drive Leicester, LE4 5NU Leicester, LE4 5NU (GB)